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The FIS-B display modes are annunciated next to the WX button. A
single two digit number appears to the right of the WX annunciations
representing time in minutes since the last precipitation update from
the data link receiver.
Note: FIS-B lightning may be co-displayed with WX-500 lightning
strike information, when a WX-500 is also connected to the SN3500.
Precipitation Intensity
Precipitation intensity level is represented graphically using the
following colors shown in Figure 7-7.
Rain Greater than 40 DBZ, Heavy
No radar coverage
No echo
Rain 20 - 30 DBZ, Light
Rain 30 – 40 DBZ, Moderate
Snow
Mixed
Figure 7-7 Precipitation
FIS-B Lightning
FIS-B lightning strikes are depicted by small filled circles. Lightning
strike age is displayed by the filled color in the circle representing
the lightning strike. Three color shades are used to represent strike
aging per table 7-1.
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Figure 7-8 FIS-B lightning strike age
After 15 minutes, the strike is removed from the screen.
FIS-B Services Backgrounder
The goal of FIS-B data link systems is to provide weather and other
non-control flight advisory information to pilots in a manner that will
enhance their awareness of the flight conditions and enable better
strategic route planning. The information provided through FIS-B is
advisory in nature. This information is provided to be better able to
assess the need to consider alternative future route and altitude
selections.
This implementation of the FIS-B data link system is not intended to
replace existing voice networks, Flight Service Station (FSS)
services, preflight briefings, or usurp any joint duties or
responsibilities required by part 121 operators. Loss or non-receipt
of FIS-B services would not be considered flight critical.
FIS-B products are to be used only for advisory and
strategic/planning purposes and not for crew alerting or tactical
flying. This is due to the fact that FIS-B products may have
significant latency between the observation of a weather
phenomenon, the issuance of a forecast or the change in airspace
status, and the display of that information in the cockpit.
Because the updates rates are relatively low, FIS-B products should
not be used for tactical maneuvering of the aircraft, and should not
be the sole basis for immediate corrective action by the pilot. FIS-B
products are intended to enable pilots to determine if action should
be taken well before it is required, and should be used in
